Cooling system for sideboard motors



Oct. 1s', v1938.

COOLING SYSTEM FOR SIDEBOARD` MOTORS original Filed Nov. 2, 195s 3 Sheets-Shed 1 oct. 1s, 193s. A. LESAGE 2,133,458

cooLING sYSTEM FOR sIDEBoARDMoToRs Original `Filed'Nov. 2, 1935 3 Sheets-Sheet 2 Hl Inventor Oct. 18, 1938. A. LESAGE COOLING SYSTEM Fon sIDEoARn MoToRs,

Original Filed Nov. 2, 1935 4 3 Sheets-Sheet 3 Inventor y@ aww 7 Patented Oct. 18, 1938 UNITED STATES vPATENTl OFFICE Original application November 2, 1933, Serial No.A 696,303. Divided and this `application December 29, 1936, Serial N o. 118,167. In Germany November 5, 1932 4 Claims.

This application is a division of my copending application Serial No. 696,303, filed November 2, i

1933, now Patent No. 2,070,364.

The invention relates to a cooling system for outboard'engines, and" more particularly sideboard engines, and the special arrangement of the feeding and discharge conduits both extending with their free ends into the water.

The object of the invention is to so devise the cooling circuit that the water is driven therethrough by the combined effect of the admission pressure due to the travel of the vessel and the suction generated in the discharge branch due to centrifugal force.

This object is4 attained by the provision of a feeding pipe extending substantially vertically from the motor down into-the water and discharge channels formed in the hollow propeller shaft and the propeller vanes. This arrangement will constitute a circuit of the least length and high cooling effect, no separate driving means being required for impelling the water through the cooling jacket of the motor.

Another object of the invention is to reduce weight and dimension of the unit and to render the motor compact by articulating a projecting feeding pipe of the cooling system upon the motor thereby facilitating the evacuation and the transport of the motor.

In the annexed drawings, which form a part of this specification, by way of example a sideboard motor in connection with the cooling appliance according to the invention is represented.

Fig. l is a longitudinal sectional elevation of the outboard motor and cooling circuit on the broken line I--I of Fig. 2;

Fig. 2 is a plane view, partly in section, on the line II-lI of Fig. l;

Fig. 3 isan end view of the outboard-motor unit. l

Like numerals denote like parts throughout all figures of the drawings.

The sideboard motor comprises the engine cylinder 4, the crank case 5, a ywheel-magneto device 6, a starting appliance 1 attached to the flywheel, the propeller shaft 8, a fuel tank 8 placed above the engine cylinder 4, a muiiler 25 arranged -by the side of, anddirectly connected to, the motor, and a carbureter III, all these items being combined to form a.- unit. From the ,crank case 5 laterally projects a sleeve II designed to interconnect the said unit with a tubui `lar carrier I2 projecting from the side board of a boat.

The propeller shaft 8 is arranged transversely (ci. 11s- 17) to the crank shaft of the engine and parallel to the axis of the engine cylinder i, the drive being transmitted thereto through the intermediary of a worm or helical gear I5 the reduction ratio of which is preferably one half.

'I'he water cooling system of the motor cylinder is composed of a `trunk I8 pivotally articulated to the bottom part of the unit through a swing valve or hollow pivot I9, channels 26 leading to the water jacket 21 of themotor cylinder l, and other channels 28 interconnecting the said jacket to the inner end of the hollow propeller shaft 8, the discharge being made through said shaft and holes I6 of the vanes of the propeller I1.

The operation of the water cooling conduit is as follows.

When the nozzle I8 is swung down as shown in Fig. 1 in full lines its water admission opening I8a is placed in the direction of travel of the boat so that the pressure generated therein by the reactionof the water will rise a Water stream to the valve I8 and further through the channel 26 into the jacket 21. A boss I8b of the nozzle striking an abutment 18a of the crank case 5 will secure the nozzle I8 .in its right working position against the reaction of the water. T he .cooling water having passed the jacket 21 is discharged through the channel 28', the bore of theV propeller shaft 8 and the discharge holes in the vanes of the propeller I1, a suction eiect due to centrifugal force assisting the circulation in the conduit. Before dismounting the unit from the boat, the nozzle can be swung upwards lengthwise the unit as shown in Fig. 1 by .dotted lines and in Fig. 2 by full lines. Then air can enter the nozzle through the mouth- 18a, permitting the evacuation of the entire system from water which flows out through the propeller shaft-and propeller. The unit thus made lighter and compacter can now be handled more easily.

I claim: 1. 1n combination with an outboard motor unit, including an internal combustion engine, a. cooling jacket for said engine,"a hollow propeller shaft communicating with said jacket, and a propeller having cooling water discharge apertures communicating with the interior of said shaft, a water admission pipe communicating with said jacket whereby cooling water will circulate successively through said pipe, said jacket and said shaft, and out through said apertures, said pipe being pivotally connected to said unit so that starts and whenswung above the water level automatic discharge of the circuit takes place.

2. The combination with an outboard unit, of on internal combustion engine, a cooling jacket of said engine, and a circuit interconnected with said jacket, including an admission branch and a discharge branch, said admission branch including atubular nozzle with its mouth facing in the direction of travel and a pivotal connection permitting adjusting said nozzle to a lower operative circulation position or to an upper inoperative and totally discharging position, and said discharge branch including a hollow propeller shaft and propeller vanes, the latter having discharge apertures radially spaced from the propeller axis.

3. In combination with an outboard motor unit, including an internal combustion engine, a cooling jacket for said engine, a hollow propeller shaft communicating with said jacket, a propeller ,having cooling water discharge apertures communicating with the interior of said shaft, a Water admission pipe having its lower'water adg mission aperture facing in the direction of travel of the motorl boat, in water receiving position,

and a hollow adjustable pivot device located at the upper end of said pipe, providing communication between said pipe and said cooling jacket and permitting adjustment of thepipe from operative vertical to inoperative horizontal position. 4. The combination with an outboard motor unit, of an internal combustion engine, a cooling jacket of said engine, and a circuit nterconnected with said jacket, including an admission branch and a discharge branch, said admission branch including a tubular nozzle with its mouth facing in the direction of travel of the motor, in water receiving position, and a pivotal connection in the shape of an adjustable cocklike articulation permitting adjustment of said nozzle to a lower operative circulation position or to an upper inoperative and totally discharg-v ALFRED LESAGE. 

